I am attempting to update my Intel Compute stick from a W10 technical preview version from July 2015 (left it in a box for a LONG time) to the latest version of Windows 10. I cannot boot from USB for some reason so my only shot is attempting to run the upgrade from within the old technical preview. When I do this, the upgrade utility asks me for a product key. I have tried some keys I personally own (Windows 10 Education, Windows 10 Pro) but they say the keys are invalid or not meant for this version. I have created my USB from the Windows media from the Media Creation Tool from Microsoft. The fun part is that I have to keep changing the date to July 2015 in the BIOS in order to stop it from locking me out (messages about components being expired). Any assistance with the key OR the Intel Compute Stick issue would be appreciated. This is my first time posting, I hope this format and board is OK.